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From unix script i want to read string value in a file from position 2 to 5. which command can be used or any alternatives there??

Thanks for the suggestion.:)

Say folder archive/ contains many folder each created on a day. this folder may contain files. i want to write a script to delete all the folder inside archive/ which are 7 days older. i used the...

i want to delete all the files in my directory except the latest one. i need to do this from shell script.
say i have
a.txt - latest file
b.txt,
c.txt..
it should delete all the files except...